Q-Series Duct Relative Humidity and Relative Humidity ...

Technical Specification Sheet
Document No. 149-991
August 26, 2009
Q-Series Duct Relative Humidity and
Relative Humidity & Temperature
Sensors
Figure 1. Q-Series Duct Relative Humidity and Relative Humidity &
Temperature Sensor.
Figure 2. Q-Series Duct Relative Humidity and Relative Humidity &
Temperature Sensor with Display.
Figure 3. Q-Series Relative Humidity Removable Sensing Tip.
Description
The Q-Series Duct Relative Humidity and Relative
Humidity & Temperature Sensors monitor and
transmit changes in humidity and temperature to
the building control systems. These units are
especially suited for applications where precise,
stable humidity sensing is required. Certified units
are also available where certification is required.
Several models are available ⎯ for humidity only
(in 5%, 2% and certified) or for humidity and
temperature sensing (also in 5%, 2%, certified),
and display versions. The humidity only units are
available in either 4 to 20 mA or 0 to 10 Volt signal
versions. Combination humidity and temperature
units are also available in either dual current or
voltage versions, transmitting proportional signals
back to the controller. Nickel 1000 ohm or Platinum
1000 ohm RTD temperature outputs on
combination versions are also offered.
2% and certified versions are equipped with a
removable, replaceable sensing tip. The removable
sensing tips have a Lumberg connection that
allows the user to screw off the tip without
disrupting the installation or wiring. Siemens
sensors with replaceable tips are ideal for
applications where measurement accuracy is
critical and sensor replacement is not an option.
Replaceable sensing tips eliminate the need for
accuracy adjustment.
All certified sensors include a certificate of
calibration. Humidity calibration and certification is
based on a three-point process at 20, 50, and 85%
rh @ 23°C.
Siemens Building Technologies, Inc. Page 1 of 3

Specifications – Humidity Element
Measurement range
0 to 100% rh
Accuracy at room temperature of 73°F (20°C) QFM2xxx types: ±5% rh, 0 to 95% rh (±3% rh, 30 to 70% rh)
QFM3xxx types: ±2% rh, 0 to 95% rh
Temperature effect
Sensing element
Output signal-rh only units
Output signal-rh/T units
Polarity protection
Calibration
Time constant
Less than 0.1% per degree C
Capacitive humidity sensing element
4 to 20 mA or 0 to 10 Vdc, 0 to 100% linear, proportional
0 to 10 Vdc or 4 to 20mA (both outputs), 0 to 100% linear,
proportional
Yes
None
Approximately 20 seconds in moving air
Specifications–Temperature Element (for combination RH/T units only)
Accuracy:
Output
signal
QFM2110 (Platinum)
QFM2120 (Nickel)
± 1.4°F: 59°F to 95°F
(+ 0.8°C): (15°C to 35°C)
± 1.8°F: -31°F to 59°F and 95°F to 158°F
(+ 1.0°C): (-35°C to 15°C and 35°C to 60°C)
Platinum 1K ohm RTD (385α)
Nickel 1K ohm RTD (Siemens)
QFM2160
QFM2171
QFM31xx
QFM41xx
± 1.4°F: 59°F to 95°F
(+ 0.8°C): (15°C to 35°C)
± 1.8°F: -40°F to 59°F and 95°F to 158°F
(+ 1.0°C): (-40°C to 15°C and 35°C to 60°C)
0 to 10 Vdc (QFMx160)
4 to 20 mA (QFMx171)
General Specifications
Operating conditions
Relative humidity
Temperature range:
QFM2110, QFM2120
QFM2160, QFM2171, QFM31xx, QFM41xx
Installation
Connections
Dimensions
Environmental conditions
LCD display readable
Voltage requirement
Input impedance (4 to 20 mA versions only)
Housing material type
Housing protection class
Filter material and specification
0 to 100%
-31°F to 140°F (-35°C to 60°C)
-40°F to 158°F (-40°C to 70°C)
18 AWG cable length shared in conduit with other sensor wiring
750 ft (229 m) max
Screw terminals
Probe: .6" OD × 7.2" L (15 mm × 183 mm)
Housing: 3.1" L × 2.3" W × 1.5" D (80 mm × 60 mm × 40 mm)
-13°F to 158°F (-25°C to 70°C)
13.5 to 35 Vdc
Less than 500 ohms
Polycarbonate plastic, UL 94-5VB rated, suitable for plenum
installations
IP 65 (QFM3xxx, QFM4xxx types), IP54 (QFM2xxx types),
NEMA 1 (all types)
Teflon, 10 micron filter
Page 2 of 3
Siemens Building Technologies, Inc.

Agency certification
CE conformance
Weight
Without LCD display
With LCD display
Ordering Information
Part Number
QFM2100
QFM2101
QFM2110
QFM2140
QFM2160
QFM2171
QFM3100
QFM3101
QFM3160
QFM3160D
QFM3171
QFM3171D
QFM4101
QFM4160
QFM4171
UL listed to UL 873 for Temperature Indicating and Regulating
Equipment
EMC directive 2004/108/EC
7.34 ounces (0.208 kg)
23.49 ounces (0.666 kg)
Description
Duct humidity sensor, (5%) 0 to 10 Vdc
Duct humidity sensor, (5%) 4 to 20 mA
Duct humidity sensor, (5%) 0 to 10 Vdc/Temp 1K ohm Platinum RTD (385 Alpha)
Duct humidity sensor, (5%) 0 to 10 Vdc/Temp T1
Duct humidity sensor, (5%) 0 to 10 Vdc/Temp 0 to 10 Vdc
Duct humidity sensor, (5%) 4 to 20 mA/Temp 4 to 20 mA
Duct humidity sensor, (2%) 0 to 10 Vdc
Duct humidity sensor, (2%) 4 to 20 mA
Duct humidity sensor, (2%) 0 to 10 Vdc/Temp 0 to 10 Vdc
Duct humidity sensor, (2%) 0 to 10 Vdc/Temp 0 to 10 Vdc, with display
Duct humidity sensor, (2%) 4 to 20 mA/Temp 4 to 20 mA
Duct humidity sensor, (2%) 4 to 20 mA/Temp 4 to 20 mA, with display
Duct humidity sensor, 4 to 20 mA (certified)
Duct humidity sensor, 0 to 10 Vdc/Temp 0 to 10 Vdc (certified)
Duct humidity sensor, 4 to 20 mA/Temp 4 to 20 mA (certified)
Accessories
AQF3101
Sensor filter cap
AQF3150
Replaceable 2% sensor tip
AQF4150
Replaceable 2% certified sensor tip
74 662 0104 0 US 1/2-inch rigid conduit adapter
74 662 0068 0 Replacement flange kit
Information in this document is based on specifications believed correct at the time of publication. The right is reserved to make changes as
design improvements are introduced. Teflon is a registered trademark of DuPont. Other product or company names mentioned herein may be the
trademarks of their respective owners. © 2009 Siemens Building Technologies, Inc.
Siemens Building Technologies, Inc.
Industry Sector
1000 Deerfield Parkway
Buffalo Grove, IL 60089-4513
Your feedback is important to us. If you have
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SBT_technical.editor.us.sbt@siemens.com
Document No. 149-991
Printed in the U.S.A.
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